R&S ZNL Series - Page 398

VNA GUI reference
R&S
®
ZNL/ZNLE
398User Manual 1178.5966.02 ─ 20
Lets you choose the frequency range, and the number of points per sweep.
5. Select the measurement bandwidth and source power.
Choose a typical measurement bandwidth and one of three typical source power
values. A smaller measurement bandwidth increases the dynamic range but slows
down the measurement. If necessary, select a smaller source power to protect the
input port of the analyzer.
Note:
The predefined bandwidths and source powers have been selected according to
the following criteria:
● The large measurement bandwidth ("Fast Sweep") ensures that the noise of an
S
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trace at minimum source power and 0 dB attenuation is smaller than 0.1
dB.
● The default source power for a passive DUT ensures that the analyzer receiver
is in its linear range (no compression) if a passive DUT with 0 dB attenuation is
measured. The default source powers for active DUTs ensure no compression
if an active DUT with 20 dB or 40 dB gain is measured.
If the actual gain of the DUT is higher than 50 dB, then the default source
power of -40 dB is still too high. It must be changed after finishing the wizard.
6. Perform a calibration (optional).
Allows you to perform a calibration. The "S-Parameter Wizard" proposes a full 2-
port calibration of the test ports selected in step 1. Automatic calibration is also
possible (if a calibration unit is available).
Tip:
You can skip the calibration step (select "Finish now without Calibration") if one of
the following applies:
● A valid calibration is already assigned to the active channel
● You want to apply a valid calibration stored in the cal pool.
● You do not want to use a calibration, e.g. because the factory calibration is
accurate enough for your measurement.
Instrument reset
To obtain a predictable result, the measurement wizard has to reset all settings except
the current calibration data. Store your channel setup if you do not want to lose the cur-
rent configuration.
10.7.1.3 Balanced Ports dialog
The "Balanced Ports" dialog allows you to enable/disable physical ports and to define
logical ports (balanced or unbalanced) in the active channel.
Access: [Meas] > "S-Params" > "Balanced Ports..."
Meas softtool